3+x+3x=7 - solution

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Solution for 3+x+3x=7 equation:

x in (-oo:+oo)

x+3*x+3 = 7 // - 7

x+3*x-7+3 = 0

4*x-4 = 0 // + 4

4*x = 4 // : 4

x = 4/4

x = 1

x = 1

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